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of Chadwell Heath, Essex
Whilst working for his father at John C. Fuller and Son, Leonard Fuller invented the "Block Accumulator", a more reliable form of accumulator than the plate accumulator, which was especially valued for use by the railways.
1915 the Fuller Accumulator Co was formed to develop the Block type of accumulator. The starter and lighting accumulators were sold under the tradename Sparta.
1918 AGM of the company told that the demand for miner's electrical lamp was an important source of new business